http://www.greenpowerscience.com/SHOPSTIRLINGENGINES.html
This is a new design I found, they work with a Fresnel Lens or a Parabolic Mirror. Strong and efficient for its size. About 15-40 watts.
We have been trying different videos and had a run of experiments not going right. Also Florida is very cloudy from June – July, this video took 4 hours to shoot waiting for the clouds.
Duration : 0:1:1
http://www.greenpowerscience.com/